Polylactide (PLA)-clay nanocomposites prepared by melt compounding in the presence of a chain extender

Najafi, Naqi; Heuzey, M. C.; Carreau, Pierre J.

doi:10.1016/j.compscitech.2012.01.005

Cited by 205 publications

(171 citation statements)

References 25 publications

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“…Several studies have been performed, using PLA as polymeric matrix in nanocomposites with fillers such as cellulose, silica and clays [8][9][10][11][12][13][14] .…”

Section: Introductionmentioning

confidence: 99%

Development and characterization of hybrid materials based on biodegradable PLA matrix, microcrystalline cellulose and organophilic silica

Santos

Tavares

2014

Polímeros

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Abstract:The goal of this work was to investigate the production and properties of hybrid materials based on poly(lactic acid) (PLA), employing microcrystalline cellulose (MCC) and organophilic silica (R972) as fillers. The composites were obtained by solution casting to form films. Each nanoparticle was incorporated at 3 wt. %, relative to the polymer matrix. In this experiment, four films were obtained (PLA, PLA/MCC, PLA/R972 and PLA/MCC/R972). The films properties were evaluated by X-ray diffractometry, nuclear magnetic resonance, Fourier transform infrared spectroscopy and mechanical properties. The results showed that each nanoparticle, added individually or both combined, had different effect on the final properties of the films. Microcrystalline cellulose can act as nucleating agent for the crystallization of PLA. Silica promoted an increase in rigidity, due to the strong intermolecular forces, while MCC addition promoted an increase in the molecular mobility of the polymeric chains. The PLA/MCC/R972 film showed the highest crystallinity degree and tensile modulus. This film presented a T 1 H value between both values found for PLA/MCC and PLA/R972 films. The results indicated that silica R972 could promote a decrease of the surface tension between PLA and cellulose.

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“…Several studies have been performed, using PLA as polymeric matrix in nanocomposites with fillers such as cellulose, silica and clays [8][9][10][11][12][13][14] .…”

Section: Introductionmentioning

confidence: 99%

Development and characterization of hybrid materials based on biodegradable PLA matrix, microcrystalline cellulose and organophilic silica

Santos

Tavares

2014

Polímeros

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“…However, a second diffraction peak was observed at a greater angle (5°-5.2°) on both composites. According to Najafi, N. et al (2012) [13], the second peak may be the result of the collapse of the clay galleries in the d002 plane due to thermal degradation of the organic component of the clay.…”

Section: Xrdmentioning

confidence: 99%

“…If a small percentage of these organomodified MMT is adequately dispersed within the polymer matrix, it creates a larger interfacial area compared to conventional composites [11]. It was found that the organomodified MMT type CloisiteC30B (C30B) significantly improves the mechanical properties of the PLA nanocomposites [4,12,13]. The combination of PLA and C30B, at nanoscale, often results in remarkably improved mechanical and thermal properties with respect to pure polymers or conventional composites [9].…”

Section: Introductionmentioning

confidence: 99%

Effect of Artificial Weathering on PLA/Nanocomposite Molecular Weight Distribution

et al. 2015

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Abstract:The reduction of polylactide acid (PLA) molecular weight for amorphous and semicrystalline grade nanocomposites with 5 wt% load of organomodified montmorillonite Cloisite30B (C30B) was investigated in periods of up to 360 h under artificial weathering. A correlation between artificial and natural weathering was established. The nanocomposites were prepared by mixing the C30B in PLA matrix using two stages of extrusion followed by injection molding. In addition, we also studied materials without C30B in PLA matrix prepared by a single stage of injection, as well as with two stages of extrusion followed by injection, in order to assess thermal effects. XRD (X-ray diffraction) and TEM (Transmission electron microscope) were used to determine the layer dispersion of the C30B within the PLA. An increase in the interlayer spacing of a sandwich structure corresponding to a partial exfoliation of the C30B was found, leading to the creation of OPEN ACCESSPolymers 2015, 7 761 small particles at nanoscale of one (1.29 nm) to eight (11.76 nm) platelets. Also, GPC (Gel permeation chromatography) was used to evaluate the molecular weight decay of neat PLA and its nanocomposites due to thermal processing and subsequent artificial weathering exposure. From thermal processing, a more significant decrease of polydispersity in amorphous PLA than in semicrystalline PLA counterparts could be observed. First order fitting of molecular weight decay of samples versus time of exposure under artificial weathering was found for all materials tested. It was observed that the addition of clay favored PLA degradation in amorphous PLA, in comparison with semicrystalline PLA in both thermal processing and artificial weathering. Moreover, a possible effect of C30B interactions with PLA chains under artificial weathering could be postulated.

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“…In addition, both the ∆H c and T c decrease with increased BC nanofiber. This indicates that BC is acting as a nucleating agent, and promoting crystallization in the PLA/PEG copolymer [12,13]. …”

Section: Resultsmentioning

confidence: 99%

“…Silane chains can enhance interaction between PLA matrices and BC nanofibers [12]. Moreover, the presence of polyethylene glycol (PEG) in PLA blends lead to improving hydrophilicity and accelerates its degradation rate.…”

Section: Introductionmentioning

confidence: 99%

Bacterial Cellulose Nanofiber Reinforced Poly (lactic acid) Nanocomposite

Dahman¹

2017

MOJPS

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Polylactide (PLA)-clay nanocomposites prepared by melt compounding in the presence of a chain extender

Cited by 205 publications

References 25 publications

Development and characterization of hybrid materials based on biodegradable PLA matrix, microcrystalline cellulose and organophilic silica

Development and characterization of hybrid materials based on biodegradable PLA matrix, microcrystalline cellulose and organophilic silica

Effect of Artificial Weathering on PLA/Nanocomposite Molecular Weight Distribution

Bacterial Cellulose Nanofiber Reinforced Poly (lactic acid) Nanocomposite

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